Microwave doors are not typically made of clear glass for several reasons:
Safety: Microwaves emit high-frequency electromagnetic waves that can be harmful if directly exposed to our bodies. The door of a microwave oven is designed to contain these waves within the oven, preventing them from leaking out and potentially causing harm. The metal mesh or screen on the door helps to block the microwaves while allowing visible light to pass through.
Radiation shielding: The door of a microwave oven is constructed with materials that provide effective shielding against the microwaves. Clear glass does not offer the same level of protection as the specialized materials used in microwave doors. The design of the door ensures that the microwaves are contained inside while allowing you to see the food inside through the small gaps in the mesh or screen.
Heating and energy efficiency: The metal mesh or screen on the door of a microwave helps to reflect and contain the microwaves within the oven cavity. This design maximizes the heating efficiency by minimizing the amount of energy that is lost. If the door were made of clear glass, more microwaves would escape, reducing the efficiency of the oven and potentially interfering with nearby electronic devices.
While it may seem convenient to have a clear door to easily view the food while it cooks, the safety and functionality aspects of microwave ovens take precedence, and therefore, the doors are designed to prioritize these factors over visibility.